test-frs_params: CO rear-rules length 4 vs actual 5 (pre-existing on main)

[NewGraphEnvironment]

Problem

tests/testthat/test-frs_params.R:92 asserts:

expect_length(params$CO$rules$rear, 4)

but the bundled inst/extdata/parameters_habitat_rules.yaml now has 5 rear rules under CO. Reproducible on main without any other changes:

[ FAIL 1 | WARN 0 | SKIP 0 | PASS 136 ]
── Failure ('test-frs_params.R:92:3'): frs_params bundled rules has expected species blocks ──
Expected `params$CO$rules$rear` to have length 4.
Actual length: 5.

The bundled YAML is hand-synced from link's canonical inst/extdata/configs/default/rules.yaml (per the manual cp instruction in the file's header — automation tracked separately by #185, now migrated to link#129). A recent sync added a fifth CO rear rule but the test expectation wasn't updated.

Surfaced during R CMD check for the fresh#201 release branch. Not caused by that work — pre-existing on main.

Proposed Solution

Two paths, decide based on what the bundle should be:

1. If 5 is correct (the link rules.yaml has 5 by design): update the test to expect_length(params$CO$rules$rear, 5L). Also re-check the comment above the assertion ("4 rear rules" — needs to read 5).
2. If 4 is correct (the bundle drifted from link): regenerate the bundled YAML from link via the canonical cp step and confirm CO rear length = 4 again.

The link side's lnk_rules_build() is the authority. Verify against the latest link inst/extdata/configs/default/rules.yaml and update whichever side is stale.

Acceptance

• devtools::test() on fresh main has 0 failures.
• R CMD check STATUS no longer reports this ERROR.